Analyzing the seismic attributes, structural and petrophysical analyses of the Lower Goru Formation: A case study from Middle Indus Basin Pakistan

Abstract

The purpose of this research is to delineate the structures of the Lower Goru Formation, investigate fluid properties, and clarify the hydrocarbon-prone areas through seismic attributes analysis. First, the acquired data was matched by the interpretation datum. Structural analysis was done by performing horizon interpretation, fault interpretation, and contour mapping on the C-Interval of the Lower Goru Formation. Hydrocarbon zones were marked with the help of attribute analysis on seismic sections and were justified by petrophysical analysis. An integrated approach such as seismic structural interpretation, seismic attribute, spectral decomposition, and petrophysical analyses was used in current research to better understand geological structure and features. This research showed that normal faults are present in the area showing negative flower structure, horst and graben, and faults oriented north-west to south-east. The contour map shows structural inclination and faults bound closure near well locations. Variance attribute and spectral decomposition attribute were used to verify horizon lineation and fault behavior. Instantaneous amplitude and instantaneous phase attributes justify hydrocarbon bearing zones, and bright spots are present on seismic sections at C–Interval of Lower Goru Formation. Petrophysical analysis of the available wells showed a number of significant hydrocarbon zones having more than 55% of hydrocarbon saturation at the C-Interval of the Lower Goru Formation. The four possible reservoir zones in Sawan-02 well, two zones in Sawan-07 well, and three zones in Sawan-09 well are identified based on well data interpretation. Based on these analyses, the area of interest has a very good reservoir potential, structural closure, and visible bright spots. The current finding of this research will be helpful for future exploration and development of the Sawan area.

An integrated study for seismic structural interpretation and reservoir estimation of Sawan gas field, Lower Indus Basin, Pakistan

“…The minor faults have an enormous throw and major faults are penetrating deeper than minor faults. Mostly minor faults are responsible for negative flower structure [ 19 , 47 , 48 ].…”

Integrating watershed segmentation algorithm and supervised Bayesian classification for the assessment of petrophysical parameters, pore properties, and lithofacies: a case study from Abadan Plain, SW Iran

“…After training the classifier at the well location, lithofacies discrimination was propagated using velocity and density cubes derived from pre-stack simultaneous inversion. The velocity and density cubes are usually extracted from pre-stack simultaneous inversion (Tounkara et al, 2023).…”

A Comparative Study Based on Petrophysical and Cluster Analysis Approach for Identification of Rock Types in Heterogeneous Sandstone Reservoirs

“…21 There is more preservation of oil and gas in the voids of rocks with greater porosity, whereas permeability defines the capacity of rocks to transfer fluids. 22 These two types of reservoir parameters are determining factors for reserve estimation and oil or gas production. 23 Based on similarities and dissimilarities among groups, the purpose of cluster analysis is to categorize log records into groups that are outlying externally and analogous internally.…”

“…A given facies is generally associated with a particular environment of deposition. , Among the steps for well planning decisions, reservoir characterization is the essential one, and estimation of physical parameters, including porosity and permeability, is the basic requirement in the characterization workflow . There is more preservation of oil and gas in the voids of rocks with greater porosity, whereas permeability defines the capacity of rocks to transfer fluids . These two types of reservoir parameters are determining factors for reserve estimation and oil or gas production …”